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Operations/Analysis Unit 4
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
always be corrected using the calibration zero and/or span features.
SUMMARY
The zero and/or span calibration of 5000 series photometric Teledyne analyzers can be
quickly verified manually by using Zero and/or calibration zero offsets and/or span flags.
Refer to typical Teledyne Analytical 1475 sample system below, 3-way valves 1,2,+ 3
below are used to check internal calibration using zero and/or span filters with N2.
CALIBRATION OF H2O IN SOLVENTS
EXAMPLE
Based upon our experience when suppling photometric NIR analyzers for 0-100ppm water in solvents
like EDC, TDI, benzene and the like, the following can be incorporated for the customers pertinent
solvent.
1 Customer is responsible for introducing a reproducible dry zero fluid, typically (-75deg C)
dewpoint Nitrogen or reproducible dry EDC or TDI etc., within +/- 1 ppm H2O (for accuracy of +/- 1
% full scale).
2 When customer supplies a reproducible dry TDI zero fluid: A span flag option is available to
verify instrument full scale sensitivity. This optical flag may be (manually or automatically) introduced
into the light path within the temperature controlled (within +/- 1 deg C) sample cell compartment. This
optical span flag ( when in this temperature stable environment simulates a very stable upscale ppm
H2O reading on top of the DRY reproducible TDI zero background.
3 Conversely, a zero flag and/or offset is (manually or automatically) switched into the light path
of the analyzer after drying out the sample cell of process fluid. Consult your manual for the factor
calibration values obtained.
Actual concentration 5000/5020 series analyzer meter
Zero check
5 ppm water/TDI 5ppm water in the 5020 meter or output. Check.
or
0 ppm water in N2 5ppm water on the 5020 meter or output. with zero flag
offset introduction.
delta 0ppm water or stability check on zero verified.
Span Check
mole-sieve or dried sample
(could be from process)
5ppm water in TDI 5ppm water on the 5020 meter or output. Zero verified.
85ppm water in TDI 85 ppm water as determined by Karl Fischer titration.
(grab sample from process) (lab technique must be verified for precision.
(sampling device, Karl Fischer titrator and operator
technique)